Kao Tzu-Jen, Newell J C, Saulnier G J, Isaacson D
Rensselaer Polytechnic Institute, Troy, NY 12180, USA.
Physiol Meas. 2003 May;24(2):403-11. doi: 10.1088/0967-3334/24/2/352.
Electrical impedance tomography (EIT) is a non-invasive technique used to image the electrical conductivity and permittivity within a body from measurements taken on the body surface. Four methods are being investigated for breast cancer diagnosis by EIT today: Single voltage source, single current source and multiple current sources with a fixed pre-determined 'canonical' pattern of currents and an adaptively determined 'optimal' pattern of currents. To determine which of these four methods might yield the best distinguishability using planar electrode arrays for breast cancer detection, we placed electrode arrays on a saline tank and used each excitation pattern to detect a conducting target placed at the centre of a flat electrode array in two geometries: mammography geometry and single probe geometry. The result was that the multiple current sources method had higher distinguishability than either the SCS or the SVS method. In both these electrode geometries, the optimal current pattern had higher distinguishability than the other patterns at all distances.
电阻抗断层成像（EIT）是一种非侵入性技术，用于根据在体表进行的测量对体内的电导率和电容率进行成像。目前正在研究四种通过EIT诊断乳腺癌的方法：单电压源、单电流源以及具有固定的预先确定的“规范”电流模式和自适应确定的“最佳”电流模式的多电流源。为了确定这四种方法中哪一种使用平面电极阵列进行乳腺癌检测时可能具有最佳的可区分性，我们将电极阵列放置在盐水箱上，并使用每种激励模式在两种几何形状下检测放置在扁平电极阵列中心的导电目标：乳腺X线摄影几何形状和单探头几何形状。结果是，多电流源方法比单电流源（SCS）或单电压源（SVS）方法具有更高的可区分性。在这两种电极几何形状中，在所有距离下，最佳电流模式都比其他模式具有更高的可区分性。
